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Apertures LSS6

Apertures LSS6. Position MKQA Vacuum chamber between Q4 and TCDS. Position of MKQA magnet. Position as presented in special meeting on 24 April is not valid Additional kick to extracted beam by Q4 was not taken into account Possible positions are given assuming:

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Apertures LSS6

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  1. Apertures LSS6 • Position MKQA • Vacuum chamber between Q4 and TCDS

  2. Position of MKQA magnet • Position as presented in special meeting on 24 April is not valid • Additional kick to extracted beam by Q4 was not taken into account • Possible positions are given assuming: • MKD vacuum chamber D = 57 mm, alignment  0.5 mm • Closed orbit 4 mm • Includes beta beating, tune adjustment, residual dispersion etc. • Stored beam n1 = 7; na = 1.22; nr = 1.4 • Extracted beam n1 = 6.5 (no halo) • Extracted beam MKD kick = 110 % * 0.275 mrad

  3. Apertures MKQAJust o.k. about 13.5 m right of exit Q4

  4. At 7 m from Q4, stored beam is too large

  5. At 15 m from Q4 to extracted beam hits the vacuum chamber

  6. Apertures MKQA • For chamber of D = 57 mm, on axis two options: • Right of Q4 between 12.7 m and 14.0 m relative to exit of Q4 • Left of Q4, more than 46 m relative to exit of Q4 (right) Exit right Q4L stored MKD entrance n1 = 6.7MKD exit: n1 = 6.9 extracted Displacing the chamber off-axis makes things worse

  7. Or more than 46 m left of Q4

  8. One possibility With D = 58 mm and 1 mm off-set can swap MKQA and TCS • Disadvantages: • Radioactive environment just after the TCS • Very tight apertures At distance of 13.5 m: beta-x = 187 m ; beta-y = 557 m

  9. Other option of MKQA position > 46 m Much better from radiation point of view; can also be better for aperture! Disadvantages: * Place available in UA / cable length* Different beta-functions than originally foreseen at –47 m: beta-x = 512 m, beta-y = 162 m* Integration to be checked But …

  10. Or put MKQA on the other beam,in front of Q5 Is as putting it at the same position, but on the other beam ! Instead of position > 46 m Q4 L, can put > 382 m to the right, is about 3 m right of Q5 At 382 m from Q4, beta-x = 145.6 m, beta-y = 579.3 m

  11. Check:Two beams give very similar results

  12. Vacuum chamber between Q4 and TCDS • Aperture calculations made assuming:: • Closed orbit 4 mm, alignment  0.5 mm • Additional  5 mm for vacuum chamber alignment (if possible) • Includes beta beating, tune adjustment, residual dispersion etc. • Stored beam n1 = 7; na = 1.22; nr = 1.4 • Extracted beam n1 = 6.5 (no halo) • Extracted beam MKD kick = 110 % * 0.275 mrad

  13. Proposed solutionFirst bit • First 70 m: • Chamber with diameter of 100 mm • Assumption as given above:  9.5 mm total for alignment • 5 mm off-set of centre of chamber • CHECH IF MKB SUPPORT PASSES Extracted beam o.k. up to 73.3 m Stored beam n1 >> 7

  14. Picture at 70 m from Q4

  15. Between 70 m and 124 m from exit Q4 • Same chamber D = 100 mm, but 25 mm off-set • Still 9.5 mm total in alignment tolerance Stored o.k. from 67 m onwards Extracted o.k. up to 124.3 m

  16. Between 124 m and entrance TCDS at 126.1 m • Same chamber but alignment tolerance tighter:4  0.5  2 mm. Needs additional support. o.k. up to 133 m

  17. Entrance TCDSAt 126.15 +0.35 = 126.5 m Closed orbit:  4 mm Alignment:  0.5 mm 110 % MKD kick exterior100 % MKD kick interior Chamber just in frontof TCDS

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